Final Fantasy Cheats - PlayStation

Original mode
Successfully complete the game to unlock the "Original Mode" option, which allows the NES version of the game to be played.

Dragon Warrior reference
Find the three tombs located next to the white magic shop in Elfland. The tombstone farthest to the left reads:

"Here lies Erdrick"
"873-866"
"R.I.P."

This is a direct reference to a character in the game Dragon Warrior.

Easy experience
Northeast of the port town of Provaka is a two space wide peninsula with enemies from the Northern Continent. They offer a lot experience and are difficult to defeat unless you are around levels 12 or 13.

Inside of the Ice cave (the one with the floater) is an Eye protecting a chest (with the floater in it). The Eye is worth 800 experience and dies in one or two hits.

Level up White Mages
In Astos' Castle, the northwest castle, is a room with three treasure chests with Undeads guarding them. The two upper ones are Mummies. Use two Harm spells to wipe them out to get 150 to 300 experience, and 600 to 1200 experience for using just two spells. This is most useful immediately after getting the key from the elf prince.

Strong Monk
If you use a Monk in your party, do not equip him with any weapons. His attacks will be much stronger when using his own fists.

Adamant location
The location of the Adamant needed for Excalibur is in the tower in the sky -- you need the chime and the cube. Go in the tower and continue to the place with eight ways to travel. Go in the bottom left diagonal and fight the enemy that guards it. Open the treasure chest to get the Adamant.

Zeus Glove
Go to Bahamut's cave. Once you first enter, go to the bottom left part. The Zeus Glove will appear in the items screen if you are lucky -- There is a 1/300 chance of finding it.

Invisible guard in castle
In the first castle entered in the game, Castle Coneria, above Queen Jane's room is what appears to be a room with no one inside. Search around the room a bit, however, and you will realize that you can talk to someone although they are not there. After you rescue the princess, the message will change.